My tach has started going bonkers. Seems to occur more often after I have driven a few miles.
see it here:
https://youtu.be/OrqlAbQ9Sg8
I used to have random tach weirdness but it usually just would stick at about 3,000; not bounce around like this.
Recent changes (last summer) include:
- New engine wiring harness from Dennis (Timmy2)
Replaced original alternator with rebuilt IR Alternator
Cleaned engine bay grounds
Completely stock 1978 SC
The tach issue has started recently, there were no problems with it for about the first 6 months after the engine reseal; harness; new Alt.
Any ideas of where to begin looking for the problem?
Thanks,
Paul